Cutting-off tool.



F. HARTMANN. -CUT.TING OFF TOOL..

APPLICATION FILED JUNE l. I9Il.

, Y Patented ma 4, 1917.

A TTOHWEI/S eric.'

FEEDERICKHHARTIVIANN, 0F HOBOKEN, NEW JERSEY.

CUTTING-Orr Toor..

Specification of ALetters Patent.

Patented Dec. 4, 1917.

"Application ed June 11, 1917.v Serial No; 174,159. Y

and Improved Cutting-Uff Tool, of which the following is a full, clear, and exact description,

My invention relates to cutting-off tools particularly adapted for use on lathes.

An obj ect of the invention is to provide an elcient and inexpensive tool which will eliminate the danger of gripping during the process of cutting.

A further object of the invention is to provide a cutting-oli" tool formed of two relatively movable cutting -parts which are adapted to be fed alternately.

A still further object ofthe invention is to provide a cutting-`olil tool the cutting members of which are detachable from the feeding means so that they can be easily replaced without much labor.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure l is a top plan of a cutting-off tool embodying my invention;

Fig. 2 is a similar view, certain parts of the tool holder being` broken out to show the details of construction;

Fig. 3 is a longitudinal section through the tool;

Fig. 4 is a cross section on line 4 4, Fig.

Y3; and

bore 8 extending through the entire length' of the housing. The portion 8 of the bore 8 beyond the bore 7 is threaded to receive a screw 9. The inner end of the screw has a cam groove 10 the pitch of which is not less than that or' the thread of the screw 9. The other end of the screw receives a manipulating member l0', which is preferably in the shape `of a wheel.

Apair of blades l1, when side by side, iit snugly into the bore 7 of the housing 6, that is, the cross section oi' the two blades yis identical withthe cross section of the bore 7. EachV of the blades has an extension l2 entering the groove, the extensions of the two blades being opposite one another. The cam groove is of such character that while one of the blades is moved by the advance ment of the screw 9 of the threaded portion 8 of the housing, the other remains immovable; in consequence, each blade cuts independently as the tool is advanced. Due to that fact there is no chance for the tool to be jammed, as the groove is always larger than one of the cutting blades and in consequence, there is no chance for the cutting tool to grip and force the member to be cut ol'l out of center, as happens in such cases.

In view of the fact that the blades 11 are made of special tool steel, it is preferable to provide detachable sections 13 which have extensions 12 for engaging the cam groove, and also dove-tailed projections 14 or recesses l5 for engaging corresponding recesses or projecting respectively in the blades 11.

I claim:

l. A cutting-ot?.2 tool of the class described comprising a pair of cutting blades Side by side and means for moving said blades alternately.

2. A cutting-oli tool of the class described comprising a pair of cutting blades each having a cutting end, pointing in the same direction and means for moving said blades so as to advance the blades one after the other.

3. In a cutting-olf tool of the class described, a housing, a pair of cutter side by side movable in the housing, and means associated with the housing and engaging the cutters for moving the cutters alternately.

4. In acutting-off tool of the class described, a housing, a pair of cutters slidably mounted therein, and a screw in the housing,

said screw having a cam groove, said cute the threads ofthe screw that the cutters are mov-eai alternately when the Shrew is moved in the housing.

5. In a cutting-.ottv tool of the class de- 5 scribed, a. housing,a"riieinber' adabtd'tob'e moved 1n and out of the housing, a pairof cutters in said housing, and ineans'connecting said cutters to the movable member so i- -v- 1Min 9. s:*i that the'cutters are moved 1n alternation sub 10 stantially as and for the'purpose setforth.

15 of whichiis not le'ss than lthe pitch of the thread, extensions from the blades engaging the carin groove, and means for revolving the screw 1n the housing.

. Acutting-'off tool ci the class described 20 `comprising a pair of cuttingblades disposed side by sideand a screw, including means for engaging thetwo blades and moving the blades alternately when the screw is rotated.

8. A cutting-off. toolofthe class described coiipiisig a of"`c1tting blades disposed side by side and a screw having a cam groove, said blades having means for engaging the cam groove of the screw andwhereby tlie said blades are moved alternately when the screw isrotated.

9. In a cutting-oil.' tool of the class described, a housing, aA screw revoluble in the housing and movable longitudinally of same.7 raid screw having a Cain` groove, slides in the housing having means for engaging the cam grooveof the screw whereby said slides may be moved one after' another'longitudinally of the housing, and cuttingblades detachably associated with said slides. l

FRED HARTMANN.

upies oifl'tliis patent mayI be obtained for five cents each; address-ing the Cciuimissionr of iateiits Washington, D. C. n 

